CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 20,344	$ 24,292
Accounts receivable, net of allowance for doubtful accounts of $10,419 and $9,948 as of June 30, 2018 and December 31, 2017, respectively	141,872	176,570
Receivable from related party	279	205
Inventories	28,071	26,857
Other current assets	26,526	22,508
Total current assets	217,092	250,432
Property, plant and equipment, at cost	6,514,589	6,243,481
Accumulated depreciation and amortization	(2,054,908)	(1,942,548)
Property, plant and equipment, net	4,459,681	4,300,933
Intangible assets, net	758,767	784,479
Goodwill	1,094,661	1,097,475
Deferred income tax asset	0	233
Other long-term assets, net	116,768	101,681
Total assets	6,646,969	6,535,233
Current liabilities:
Accounts payable	127,801	145,932
Short-term debt	63,000	35,000
Current portion of long-term debt	0	349,990
Accrued interest payable	36,192	40,449
Accrued liabilities	64,719	61,578
Taxes other than income tax	16,220	14,385
Income tax payable	3,357	4,172
Total current liabilities	311,289	651,506
Long-term debt, less current portion	3,380,366	3,263,069
Deferred income tax liability	23,113	22,272
Other long-term liabilities	105,013	118,297
Total liabilities	3,819,781	4,055,144
Commitments and contingencies (Note 6)
Series D preferred limited partners (15,760,441 preferred units outstanding as of June 30, 2018) (Note 11)	370,711	0
Partners' equity:
Preferred limited partners (9,060,000 Series A preferred units, 15,400,000 Series B preferred units and 6,900,000 Series C preferred units outstanding as of June 30, 2018 and December 31, 2017)	756,334	756,603
Common limited partners (93,597,181 and 93,176,683 common units outstanding as of June 30, 2018 and December 31, 2017, respectively)	1,740,768	1,770,587
General partner	25,999	37,826
Accumulated other comprehensive loss	(66,624)	(84,927)
Total partners’ equity	2,456,477	2,480,089
Total liabilities, mezzanine equity and partners’ equity	$ 6,646,969	$ 6,535,233

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.